Lathe.



G. W. DAVIS.

LATHE.

APPLIOATION FILED JULY 15, 1907.

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UM'T sear GREER W. DAVIS, OF NEW ALBANY, INDIANA.

LATHE.

Specification of Letters Patent.

Patented Sept. 28, 1909.

Application filed July 15, 1907. Serial No. 383,786.

To all whom it may concern:

Be it knownthat I, GREEK WV. DAVIS, a citizen of the United States,residing at New Albany, in the county of Floyd and State of Indiana,have invented certain new and useful Improvements in Lathes; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention has relation to new and useful improvements in lathes andrelates more particularly to the chuck and cutting tool and has for itsobject to provide means for holding and cutting brittle substances andmore especially square blocks of lime used to make lime pencils forstereopticons.

l/Vith the above and other objects in view which will appear as thenature of the invention is better understood, the invention consists incertain novel features of construction, combination and arrangement ofparts as will be hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a front elevation of a lathewith a square block from which a pencil is to be made in position, oneend of the mandrel and the chuck shown in section; Fig. 2 is a detailcentral longitudinal sectional view of the chuck; Fig. 8 is a detail endview of the chuck; Fig. 4 is a detail perspective view of the cuttingtool; and Fig. 5 is a detail perspective View of the block of lime cutin the form of a stereopticon pencil.

Referring now more particularly to the drawings, the numeral 1represents a lathe of ordinary form, 2 the head stock of the lathe, 3the mandrel, 4 the cone or step pulley for rotating the mandrel, 5 thetail stock, 6 the center piece of the tail stock, and 7 the tool rest.

The numeral 8 represents a cutting tool which is provided with an innerand upper cutting edge 9 and 10, respectively.

The numeral 11 represents the improved chuck comprising a body portion12 of preferably square form having extending from one face an integralinteriorly threaded stem 13 adapted to screw on one end of the mandreland provided in its opposite face with a square socket 14; adapted toreceive one end of a square block of lime 15, which is held in positionat its opposite end by the center 6 of said tail stock 5. Fourcorresponding clamping plates 16 are arranged in the socket of saidchuck 1 at each side wall thereof and may be adjusted laterally to clampthe sides of square blocks of different sizes by adjusting screws 17working through corresponding threaded perforations or apertures 18 inthe side walls of said socket and swiveled at their inner ends to saidclamping plates so that they may be turned independently thereof.

In the application of the invention a block of lime is arranged inposition between the chuck and center piece, and when turned by thelathe is cut in proper form by the cutting tool 8. After the firstcutting operation, this block is in the form of a cylinder of uniformdiameter throughout its entire length. The carriage supporting thecutting tool is then caused to travel back to its former position, andthe cutting tool adjusted to cut away a portion of the outer end of thelime block to form a cylindrical reduced portion or stem 18.

The cutting tool is provided with a recess 19 at the junction of itscutting edges to form a bead 20 on the lime block at the junction of theenlarged and reduced portions thereof to strengthen the same.

*vVhile the side chuck and cutting tool are especially adapted tosupport and cut square blocks of lime into lime pencils forstereopticons, they may be used in all cases where such a form of chuckand cutting tool would be found desirable.

Having thus described my invention, what I claim as new is A chuckprovided in one face with an angular socket having a flat bottom walland outwardly inclined or flared side walls, clamping plates arrangedfor radial adjustment in said socket and having their outer facesinclined inward toward their inner end, said plates having flat straightclamping faces and having their meeting edges beveled at correspondingangles to provide for greater adjustment, adjusting screws In testimonywhereof I have hereunto set screWmg through the Walls of the socket andmy hand 1n presence of tWo subscrlblng Witfreely engaged with sockets inthe inchned nesses.

faces of the clamping plates, whereby the GREEK W. DAVIS. 5 screws arepermitted to turn independently Witnesses:

of the clamping plate during the operation D. F. BOUMAN,

.of adjusting the latter. H. F. HOPKINS.

